Track-drill.



G. K. PIGKLES.

TRACK DRILL.

APPLICATION rum) 1mm 25, 1909.

Patented Aug. 16, 191 0.

2'SHEETS-BHEET 1.

g m mm Pm I .1 'E'F TTED STATES CHARLES K. IE'IGKLES, OF ST. LOUIS,MISEtOURI, ASSIGN'OR TO SHEFFIELD CAR COM- IPANY, OF THREE RIVERS,MICHIGAN.

TRACK-DRILL.

Specification of Letters Patent.

Patented Aug. 16, 1910.

To all whom it may concern:

Be it known that I, CHARLES K. PIoKLns, a citizen of the United States,residing at St. Louis, Missouri, have invented certain new and usefulImprovements in Track-Drills, of which the following. is aspecification.

This invention relates to improvements in track drills.

The main objects of this invention are: First, to provide in a trackdrill an improved feed mechanism. Second, to provide in a track drill animproved mechanism in which the feed is so connected that it is quiteimpossible for an unskilled or inexperienced workman to apply unduestress to the drill. Third, to provide an improved track drill which maybe very quickly adjusted to or withdrawn from the work. Fourth, toprovide an improved track drill which may be quickly knocked down orcollapsed to permit the passing of trains.

Fifth, to provide an improved track drill which is very simple inconstruction, and, at the same time, rigid and durable.

Further objects, and objects relating to structural details, willdefinitely appear from the detailed descriptionto follow.

I accomplish the objects of my invention by the devices and meansdescribed in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearlyillustrated in the accompanying drawing, forming a part of thisspecification, in which;

Figure 1 is a vertical section of a struc ture embodying the features ofmy invention, taken on a line corresponding to line 1-1 of Fig. 3. Fig.2 is a rear elevation of my improved track drill with the cranksremoved. Fig. 3 is a horizontal section, taken on a line correspondlngto llnes 3-3 of Figs. 1 and 2, portions of the rail-engaging hooks beingbroken away; Fig. 4 is a detail horizontal section taken on a linecorresponding to lines 4--4 of Figs. 1 and 2. Fig. 5 is a detailsection, taken on a line corresponding to line 55 of Fig. 4, showingdetails of the feed mechanism.

In the drawings, similar reference characters refer to similar partsthroughout the several views, and the sectional views are taken lookingin the direction of the little arrows at the ends of the section lines.

Referring to the drawing, I provide a horizontal frame or base which ispreferably made up of plate-like side pieces 1 and cross pieces 2 and 3,the rear cross piece 2 being preferably extended beyond the side piecesto .afiord a wide support and also so that the operators may stand uponthe same when operating the drill to assist in holding it inplace. Thebase is rovided with ways 4, the ways being pre erably in the form ofoutturned flanges at the upper edges of the side plates 1. The carriage5 is adapted to slide upon these ways and is provided with downwardlyand' inwardly turned way-engaging members 6, there being preferably fourof these, so that the carriage is held firmly upon the base, and, at thesame time, travels freely thereon. The ways preferably extend to the endof the base, so that the parts are assembled by slipping the carriagethereon from the end, as will be obvious. The carriage is provided witha pair of horizontally-arranged bearings, as 7 and 8, for the drillspindle or holders. The forward bearing 7 is provided with a thrustbearing. member 10, preferably provided with a suitable ballrace for thebearing balls 11 interposed between it and the bearing member 12, whichis secured to the drill spindle. This receives the thrust of the drillspindle and se cures the spindle against axial movement relative to thecarriage.

The spindle is driven through the drivin shaft 18, which is providedwith a beveled gear 14 on its lower end adapted to mesh with the gear 15on the drill spindle. The driving shaft 13 is carried by the upright orstandard 16, which is provided with suitable bearings as 17, 18 and 19therefor. The standard 16 is provided with a horizontal foot or baseportion 20, which is secured to the upwardly-projecting cars 21 at therear of the carriage by means of the pivot pin 22. The carriage is alsoprovided with a pair of upwardly-projecting cars 23 located at the frontthereof, the ears being perforated to receive the retaining bolt or pin24. The base 20 of the standard 1s provided with a forwardly-projectingarm 25 which is adapted to pass between these ears 23 and is perforatedto receive the retaining pin 24 whereby the standard is secured to thebase, and, at the same time, may be readily collapsed by removing thepin or bolt 24. The

crank shaft 26 is arranged transversely at the; upper end of the upright16, and is geared to the driving shaft by means of suitable beveledgears, as 27.

On the rear end of the spindle, I arrange a feed worm 28. The feed worm28 is revolubly mounted on the spindle, and. has a friction connectiontherewith. This friction connection preferably consists of the washers29 and 30 and the clamping nut 31, which is threaded upon the rear endof the spindle. The washers 29 and 30 are arranged one at each side ofthe feed worm, the spindle being shouldered at 32 to receive the innerwasher 30.

By adjusting the nut 31, the friction can be regulated so that the drillis efiectively driven, and, at the same time, when the strain thereonexceeds a predetermined point, the feed worm will slip so that the drillis not subjected to undue strain.

Co-aoting with the feed worm is a feed rack 33 which is mounted on thepivot rod 34, arranged through suitable cars 35 on the base, This rackis arranged so that it may be thrown into and out of engagement with thefeed worm, as desired. When disengaged therefrom, the carriage can beadvanced or retracted freely, as desired, to bring the drill up to orwithdraw it from the work. The rack is under ordinary circumstancesswung to its disengaging position by therearward turning of the spindle,but if it is desired to retain the same in driving engagement, this maybe done by the operator placing his foot upon the rack or upon thehand-piece 36 on the end .of the pivot rod 34. The pivot ears 33 for therack are preferably arranged to engage the frame and to serve as stopsfor limiting the downward movement of the rack, thus holding it inposition, as is shown in Fig. 5. The railengaging hooks 37 are mountedon suitable outwardly-projecting journals 38 on the base. These hooksare adapted to be thrown over the rail, as 39, for holding the machineto its work.

My improved drill is very simple and durable in construction and quicklyand easily operated. It may also be quickly collapsed or removed fromthe track to permit the passing of trains.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

I 1. In a structure of the class described, the combination with a basehaving horizontal ways'thereon; a carriage mounted on said ways; aspindle mounted on said carriage and secured against axial movementrelative thereto; a feed worm mounted on said spindle and having afriction connection thereto; a .rack carried. by said base adapted to bethrown into and out of engagement with said worm; and driving means forsaid spindle carried by said carriage. Y

2. In a structure of the class described, the combination with a basehaving horizontal ways thereon; a carriage mounted on said ways; aspindle mounted on said carriage and secured against axial movementrelative thereto; a feed worm on said spindle; a rack carried by saidbase adapted to be thrown into and out of engagement with said worm; anddriving means for said spindle carried by said carriage.

3. In a structure of the class described, the combination with a frame;a spindle; a feed worm for said spindle having a frictional connectionthereto; a feed rack arranged to be thrown into or out of engagementwith said feed worm, adapted to be automatically disengaged 011 therearward turning of the spindle; a stop for said rack when in itsengaging position; and driving means for said spindle.

4C. In a structure of the class described, the combination with a frame;a spindle; a feed worm for said spindle; a feed rack arranged to bethrown into or out of engagement with said feed worm, adapted to beautomatically disengaged on the rearward turning of the spindle; a stopfor said rack when in its engaging position; and driving means for saidspindle.

5. In a structure of the class described, the combination with a frame;a spindle; a feed worm for said spindle having a frictional connectionthereto; a feed rack arranged to be thrown into or out of engagementwith said feed worm; and driving means for said spindle.

6. In a structure of the class described, the combination with a frame;a spindle; a feed worm for said spindle; a feed rack arranged to bethrown into or out of engagement with said feed worm; and driving meansfor said spindle.

7. In a structure of the class described, the combination with a frame;a spindle; a feed worm for said spindle, having a frictional connectiontherewith; a pivoted feed rack; a hand piece for throwing said rack intoor out of its engaging position; and driving means for said spindle.

8. In a structure of the class described,

the combination with a frame; a spindle; a

feed worm for said spindle; a pivoted feed rack; a hand piece forthrowing sa1d rack into or out of its engaging position; and drivingmeans for said splndle.

In witness whereof, I have hereunto set my hand and seal in the presenceof two witnesses.

CHARLES K. PICKLES.

